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UNITED STATES reserveN PATENT OFFICE.v

GEORG-E A. MORRISON, OF IARK RIDGE, ILLINOIS, ASSIGNOR TO TORCHWELDEQUIP- MENT COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFDELAVV'AEEE.,nv

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Application filed March 19, 1927. Serial No. 176,678.

My invention relates more particularly to torches employing as the iuel,mixed gases, as tor example and more especially oxygen and acetylene,and involving a so-called flash-back chamber extending at a side oit'the mixer device in which the gases are mixed and operating to retain,during the normal operation ot the torch, a body ofthe mixed gases ttorignition in the case ot flashback to effect the extinguishmentot the'iiame in the torch substantially as disclosed in U. S. Patent No.1,304,198 granted to Carl J. Nyquist, May 20, 1919.

It has been found in practice that it is necessary, in order that thetorch function to the best advantage, that leakage ot the oxygen intothe acetylene gas passage and leakage ot the acetylene gas into theflashback chamber be prevented inasmuch as either leakage referred to isliable to result, in case oi flash-back, in sustaining the flashbackresulting in the continued burning of the gas internally of the torch`it being my primary object to prevent such objectionable intermixture otthe gases to the end that when a Itlash-back occurs, the flame in thetorch `will become extinguished and remain extinguished until the gasmixture is ignited at the tip. i

Referring to the accompanying drawings:

Figures 1 and 1a are views in longitudinal sectional elevation of aso-called cutting torch embodying' my improvements, these views beingcontinuations ot one another. Figure 2 is a view in side velevation ofthe mixer ydevice of the torch; and Figure 3, an enlarged sectional viewot the mixer device and the surrounding body portion ot the torch, thesection being taken at the line 3-3 on Fig. 1 and viewed in thedirection of the arrows.

The torch shown comprises ahandle portion si; formed oi a block 5 and asurroundf ing shell, the block 5 containing an acetyiene gas passage 7communicating with a valved itting 8 which would be connected with anysuitable source of acetylene gas. The block 5 also contains a passage 9com municating with a iitting 10 which would be connected with anysuitable supply ot oxygen under pressure, the acetylene gas passage 7communicating with one end oit a pipe 11 and the passage 9 communicatingwith a high pressure oxygen pipe 12 and a low pressure oxygen pipe 13.The connections between the passage 9 andthepipes-12V and 13 and themeans whereby the pipe 12 is is suppliedwith high pressure oxygen andthe pipe 13 with low-pressure oxygen is not illustrated as this forms nopart ot' my present invention and such au arrangement and provision ofparts is well known in the art.'

The pipe 13 connects at its 41forward end with passage-equipped fittings14, 15 and 16, as is well known in the art, the 'forward end of thefitting 16 screwing into'the rear end of a socket 17 in the head or bodyportion, 18. The forward end of the socket 17, and represented at' 19,opens into a passage 20 which, in turn, opensinto achamber 21 in theforward end of the head and in communication with the passagesQQ asusually provided `in the burner tip 23 mountedin the extremity of thehead 18 and through which the mixture ot i acetylene and lowpressureoxygen discharges for ignition at the end ci the tip. The highfpressurcoxygen pipe 12 communicates with a passage 9A opening into a centrallydisposed passage 25 inthe burner tip and throughwhich highpressureoxygen is discharged tor mixture with the intermixed acetylene andthelowpressure oxygen discharging through the passages 22, in the use otthe torch for cutting purposes.

The head 18 between the ends ot the socket 17lcontains a passage 26communicating with the acetylene pipe 11, the head 18 between thepassage 26 and the forward extremity of thesocket 17 containing a circular tapering seat 27. The socket 17 is threaded rearwardly fromthepassage 26 as represented at `28 andat the rear end ot' this threadedportion presents an annular seat 29.

The mixer device by which the low-pressure oxygen and the acetylene gasare mixed for discharge into the passage 20 and thence into the burnertip is represented at 30 and is secured in the socket 17 by theengagement ot its threaded portion 31 with the threads 281.` The forwardextremityof the mixer 3() is of such external diameter andis ofsuchlength thatwhen positioned in the body portion 1S it extends inspaced relation to the socket 17 as shown thereby affording a Hash-backchamber 32 Ain which, during the normal ,operationot the torch, acoinbustible `body composed' of acetylene and oxygen is maintained, thisiash-back chamber being in communication with the longitudinal bore 33ofthe mixer device through a passage 34 in the latter and inclining inthe direction of the flow of gas through the mixer device. The mixerdevice is :termed With an lannularbeveled shoulder 35 adapted to seatagainst the shoulder 2T and with an annular shoulder 36 adapted toengage the seat 29, the Wall ot the mixer device between the shoulder 35and thethreaded portion I3() thereof being spaced from the Wall oit thesocket-1T to provide a chamber 3T in conn munication with the acetylenegas pa i' 26, the chamber 37 being in comnmnication with the centralpassage 33 ci' the miner dcvioe through forwardly inclined radialpassages 38 in the mixer device.

The internal contour `of the socket 11T Yand the external contour ci.the mixer device are such that when the mixer device 30 yis screwed intothe .body 18 to the position shown inFig. l, the shoulders and 36 Willforcibly press againstithe seats 27 and 29 and form gas-tight joints onebetween the acetylene gas passage 26 and the loupressure oxygen passageand the other be tween this acetylene gas passage `and the flash-backchamber 32, thereby etliectually preventing leaking ot the oxygen intothe Vacetylene gas passage Q6 `and the leakage of acetylene from thisypassage `into the tlaslr back chamber 3&2 and thus `preventing thesustaining oit' the flame in the torch 'in the event of flash-back whichignites the charge in the flash-back chamber 32 and producescxtinguishment ot' the entire flame in the torch.

In the manufacture of the torches, the mixer device is termed to cause.the distance between its shoulders 35 and 3G tobe slightly greater, asfor example about 3/1000 of an inch, than the distance between `theseats27 and Q8, which ensures the production ot the desired gas-tight joints`above referred to, it being understood that by "reason oit 4theprovision of the seats 27 and 35 as shown, and the forming ot the body18 and the mixer 3l of brass and bronze, rcsijiectively, `which are thematerials usually used for these parts in torches as commonly pro vided,the metal at this forward joint becomes deformed in the drawing of theshoulder 36 into tight engagement .with the seat 29.

While I have illustrated and described a particular constructionembodying my invention, I do not'wish to be understood as intending tolimit it thereto, asthe same may be variously modified and alteredWithout departing from the spirit of my intenn tion..

What I claim as new, and desire toV secure by Letters Patent, is:

l. .A gas-torch comprising a body-portion `containing passages torgases, respectively, a mixer device in said body portion and incommunication at its rear end with one of said passages and intermediateitsl ends with the other oft said passages, a flashback chamber at theside of said niixer device in front ot said last-rcferred-to passage,and seats in said body portion between said flashback chamber and saidlast-reterred-to passage and between said passages, respectively, andiacing in a direction away from said flashback chamber, and engaged byportions ot said mixer-device to Ylorm gas-tight joints.

i3. A gas-torch comprising a body portion containing passages for gases,respectively, a mixer device in said body portion and in communicationat its rear end with one of .said passages and intermediate its endswith the other ot said passages, a flashback chamber at: thc side otsaid mixer device in trout ot said last-ret'erred-to passage, and seatsin said body portion between said Hash hack chamber and saidlast-retcrred-to passage and between said passages, respectively, andfacing in a direction away 'from said tiaslnback chalutier, and engagedby portions ot said mixer-device to form gas-tight joints, saidtirst-referred-to seat being beveled.

3. i gas-torch comprising a body-portion containing pzfissagcs forgases, respectively, a one-piece mixer device screwed into said bodyportion and in communitattion at its rear end with one ot said passagesand between .its forward end and its threaded portion with the other otsaid passages, a flashback cliamber at the side ot said mixer device in'trent ot' said last1'eierred-to passage, and seats in said bodyport-ion between said tlashwback chamber and said lastfreferred-topassage and between said passages to the rear oit the threaded portionot said mixer device, respectively, and facing in a direction away fromsaid chamber and engaged by portions of said mixer device to formgas-tight joints.

it- A gas-torch, cemprising a body-portion containing passages 'torgases, respectively, a mixer device in said body portion and inconnnunication at its rear end with one of said passages andintermediate its ends with the other ot ,id passages, a flash-backchamber at the sine oi said mixer device in front of saidlast-referred-to passages, and seats ot dillerent diameters in said bodyportion between said flashback chamber and said last-relerred-to passageand between' said passages, respectively, and iacing in a-dircc tionaway trom said chamber and engaged by portions ot said mixer-device toform gas-tight joints, the smaller ot said seats being innermost.

GEORGE n. MORRISON.

